Mantvydas of Poland

Mantvydas of Poland (2 January 1314-) was the jure uxoris King of Poland from 22 January 1338 to 24 November 1342, being the consort of Elzbieta of Poland.

Biography
Mantvydas was the fifth son of King Gediminas of Lithuania and Queen Olga of Lithuania, ninth out of twelve children; he was a scion of the House of Gediminaitis. Prince Mantvydas was betrothed to Elzbieta of Poland, and he wed Elzbieta in January 1342 after she came of age. Mantvydas was therefore the jure uxoris King of Poland, threatening to unite the Kingdom of Poland and Kingdom of Lithuania under one banner. Mantvydas and Elzbieta were forced out of power on 24 November 1342 when Holy Roman Emperor John the Blind backed Elzbieta's younger sister Kunegunda's claim to the throne, and Mantvydas and Elzbieta were reduced to nobles.